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MMS 4 — Live Satellite Tracking (NORAD 40485)

MMS 4 is one of NASA’s four Magnetospheric Multiscale spacecraft. The tracking catalog lists it as MMS 4 (NORAD catalog number 40485); follow it live on the WatchSat interactive 3D globe above. Its position is propagated in real time from the latest CelesTrak two-line element set using the SGP4/SDP4 orbital model — the same math professional trackers run. It is object D of 2015's 11th orbital launch (COSPAR designation 2015-011D). It went up together with 3 other satellites from that launch still in the active catalog.

Its speed swings from 0.63 km/s at apogee to 6.50 km/s at perigee. MMS 4 follows a highly elliptical orbit, completing a revolution every 84.2 hours. The orbit is strongly elliptical (eccentricity 0.8236): each revolution swings from 10,832 km at perigee out to 171,520 km at apogee. Inclined 73.3° to the equator, it overflies every latitude up to about 73° north and south. Its orbital plane crosses the equator northbound at right ascension 347.3°.

Orbital elements

Orbit regime	highly elliptical orbit (HEO)
Perigee × apogee altitude	~10,832 km × 171,520 km
Inclination	73.25°
Orbital period	5053.4 min (0.28 rev/day)
Eccentricity	0.82365
Element set epoch	2026-10-21
COSPAR designation	2015-011D
NORAD catalog number	40485

This page's orbital elements come from the CelesTrak catalog of 2026-10-23. The live 3D view above fetches its own current CelesTrak data when the page opens, through an edge cache that refreshes roughly every 30 minutes.

About the Other Active Satellites group

MMS 4 is one of 4,802 active satellites in WatchSat's general catalog — the broad population of Earth-observation, communications, science, amateur-radio and technology spacecraft outside the giant broadband constellations. Browse all other active satellites live in 3D.

Can you see MMS 4 from the ground?

Not with the naked eye. At its altitude MMS 4 is far beyond unaided visibility — following satellites this high takes a telescope and good timing. You can still track it precisely in the live 3D view above, or check the “When can I see it?” panel in the live view.

Related satellites

Nearest catalog neighbors of MMS 4 in the Other Active Satellites group — usually craft from the same or adjacent launches:

Browse the Other Active Satellites directory or the full satellite directory.

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